The Easiest Thing In The World

To think bad thoughts is really the easiest thing in the world.  If you leave your mind to itself it will spiral down into ever-increasing unhappiness.  To think good thoughts, however, requires effort.  This is one of the things that discipline -- training -- is about.

-- James Clavell (1924-1994), British novelist, screenwriter, World War II hero and POW, Shogun, Chapter 5 (1975)